[EBB Sightings] Fox Sparrow subspecies?

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As a relatively new California birder, I am unsure which subspecies of Fox  
Sparrow I saw in my El Sobrante yard today. Looking at the NG guide, I  thought 
"unalaschcensis".  But when I went to Sibley for comfirmation  I got totally 
confused.  Sibley doesn't use Latin subspecies names for this  bird so I can't 
correlate them with NG. Help, please!  Thank you.
 
_Hungry Mouth_ (http://hungrymouth.typepad.com/hungry_mouth/)  

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Sparrow I saw in my El Sobrante yard today. Looking at the NG guide, I=20
thought "unalaschcensis".  But when I went to Sibley for comfirmat=
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bird so I can't correlate them with NG. Help, please!  Thank you.
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